AS7220 datasheet(14/33 Pages) OSRAM

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ams Datasheet

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[v1-00] 2017-Feb-16

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AS7220 − Detailed Description

AS7220 Smart Lighting Manager - Overview

The Cognitive Light Engine (CLE) is the “brains” of the Smart

Lighting Manager. The CLE constantly processes information

from the calibrated XYZ chromatic white/color sensor and

inputs while controlling outputs. AS7220 initial setup and

ongoing parameter storage is automatically performed by

software within the required external serial flash memory, via

SPI bus.

XYZ color point response is implemented via standard observer

interference filters which are extremely stable over time and

temperature. Filter accuracy is affected by the optical angle of

incidence which itself is limited by an integrated aperture and

an internal micro-lens structure in the AS7220. The package

field of view (PFOV) is ±20.5° to deliver the specified accuracy.

External optics can be used as needed to expand or reduce this

built in PFOV.

A luminaire solution for chromatic white/color maintenance

with CCT maintenance and/or lumen maintenance requires the

AS7220. A luminaire solution with chromatic white

color/maintenance, lumen maintenance and daylighting

requires only the addition of an ams TSL4531 single chip

ambient light sensor, connected via I²C. Refer to the table in

Figure 15 below.

Overall AS7220 timing generation uses an on chip 16MHz

temperature compensated oscillator for master clock timing.

Refer to the separate AS7220 User Guide for additional usage

and setup information.

Figure 15:

AS7220 Solution Chart

Solution Required

Device Orientation

(from luminaire light source)

Chromatic Color

Maintenance

Lumen

Maintenance

Daylighting

AS7220

TSL4531

(optional)

√√

↑

(into luminaire)

(not required)

√√

√

↑

(into luminaire)

↓

(into room)

Detailed Description

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